我的java之路-----操作xml-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_37330773/article/details/80619499

本文介绍了一个使用Java进行XML文件创建、更新及删除操作的示例。通过此示例，读者可以了解如何利用Dom4j库来实现XML文档的解析与生成。包括添加注释、创建根节点、设置属性值等基本操作。

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package io;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;

import javax.sql.rowset.spi.XmlWriter;

import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;

public class xml4Demo {
	public void CreateXml() throws DocumentException{
		File file=new File("E://new.xml");
		Document doc=null;
		if(!file.exists()){
			//创建一个xmlwend
		 doc=DocumentHelper.createDocument();	
		}else{
			 doc=new SAXReader().read(new File("E://new.xml"));
		}
		
		//写注释
		doc.addComment("这是注释");
		//创建根节点
		Element root=doc.addElement("students");
		//给student 添加一个节点
		Element stuEle=root.addElement("student");
		stuEle.addAttribute("id", "1");
		Element nameEle=stuEle.addElement("name");
		nameEle.addText("张三");
		//设置格式化xml
		OutputFormat format=OutputFormat.createPrettyPrint();
		format.setEncoding("utf-8");
		Writer out;
		try {
			out =new FileWriter("E://new.xml");
			XMLWriter writer =new XMLWriter(out,format);
			writer.write(doc);
			writer.close();
			System.out.println("生成文件成功");
		} catch (Exception e) {
			System.out.println("生成xml文件失败");
			e.printStackTrace();
			// TODO: handle exception
		}
	}
	//修改xml
	public void updateXml(String id) throws IOException, DocumentException{
		//读取文件
		Document doc=new SAXReader().read(new File("E://new.xml"));
	    Element stuEle =(Element) doc.selectSingleNode("/students/student[@id='"+id+"']");//寻找节点
	    stuEle.element("name").setText("haha");//设置值
	    FileOutputStream out =new FileOutputStream("E://new.xml");
	    OutputFormat format= OutputFormat.createPrettyPrint();
	    format.setEncoding("utf-8");
	    XMLWriter writer =new XMLWriter(out,format);
		writer.write(doc);
		writer.close();
	    
			
	}

	//删除
	public void deleteXml(String id) throws DocumentException, FileNotFoundException, Exception{
		Document doc=new SAXReader().read("E://new.xml");
		Element stuEle=(Element) doc.selectSingleNode("/students/student[@id='"+id+"']");
		stuEle.detach();
		  FileOutputStream out =new FileOutputStream("E://new.xml");
		    OutputFormat format= OutputFormat.createPrettyPrint();
		    format.setEncoding("utf-8");
		    XMLWriter writer =new XMLWriter(out,format);
			writer.write(doc);
			writer.close();
	}
	public static void main(String[] args) throws DocumentException, IOException {
		xml4Demo dome=new xml4Demo();
//		dome.CreateXml();
		dome.updateXml("25");
	}
}